Manuscript Summary: The first part of a breviary intended for use by a Franciscan, perhaps a Poor Clare, was referred to as Horae canonicae in earlier literature. It was written in 1459 on high quality parchment by the well known scribe Johannes Frauenlob. The coats of arms of Constance families Schatz and Guldinast allow us to make inferences about who commissioned it. Rich book decoration includes gold-grounded initials, filigree, and margin borders. About 30 figured and illustrated initials by two stylistically distinct hands, of which the first is distinguished by particular virtuosity: «Der mit zahllosen Farbpunkten vorgenommene Farbauftrag, die heitere Rankenmalerei […] und auch das geschärfte Verständnis für Fernwirkung bei Landschaftsdarstellungen sind beinahe einzigartig für diese Zeit in der Bodenseemalerei.» (Bernd Konrad). (spe)